[Limdep Nlogit List] WTp estimation
Fredrik Carlsson
fredrik.carlsson at economics.gu.se
Wed Jul 25 04:03:15 AEST 2018
You should most likely take away SD_pric from labels. I assume this was the label for the random price coefficient that is now fixed instead
Fredrik
Skickat från min iPhone
> 24 juli 2018 kl. 19:56 skrev medard kakuru via Limdep <limdep at mailman.sydney.edu.au>:
>
> Dear Bill,
> Precisely, this is what I am doing.
>
> WALD; Labels=colb,
> colw,
> colc,
> tast,
> tex,
> smel,
> siz,
> pric,
> SD_colb,
> SD_colw,
> SD_colc,
> SD_tast,
> SD_tex,
> SD_siz,
> SD_smel,
> SD_pric
> ;start=b
> ;Var=Varb
> ;Fn1=-1*(colb/pric)
> ;Fn2=-1*(colw/pric)
> ;Fn3=-1*(colc/pric)
> ;Fn4=-1*(tast/pric)
> ;Fn5=-1*(tex/pric)
> ;Fn6=-1*(siz/pric)
> ;Fn7=-1*(smel/pric)$
>
>
> When I double click the B matrix, I see one column with 15 entries in it.
> How am I supposed to use the entries in the specification above, since I
> have arleady specified b as starting values?
>
> Thanks,
>
> Medard
>
>
>
> On Tue, Jul 24, 2018 at 8:42 PM, William Greene via Limdep <
> limdep at mailman.sydney.edu.au> wrote:
>
>> Medard. Look at your output in the output window. Then, double click B in
>> the
>> project window, and you will see what is contained in B in the right
>> order. When
>> you use ;Start=B ; Var = Varb you can then use the right ;Labels = list...
>> THEN
>> set up your functions.
>> /.B. Greene
>>
>> On Tue, Jul 24, 2018 at 12:34 PM, medard kakuru via Limdep <
>> limdep at mailman.sydney.edu.au> wrote:
>>
>>> Thanks Bill.
>>> However, I seem not to understand the matching and the submission you are
>>> talking about. Kindly give me a reference in the nlogit manual so that I
>>> read for more understanding.
>>> Thanks.
>>> Medard
>>> On Tue, Jul 24, 2018, 19:03 William Greene via Limdep <
>>> limdep at mailman.sydney.edu.au> wrote:
>>>
>>>> Yes you can. After estimation, double click on the B matrix and see
>> what
>>>> is in there.
>>>> Match it up against your output. Then submit B and VARB as the
>>> parameters
>>>> and
>>>> variance for the command.
>>>> /B. Greene
>>>>
>>>> On Tue, Jul 24, 2018 at 11:52 AM, medard kakuru via Limdep <
>>>> limdep at mailman.sydney.edu.au> wrote:
>>>>
>>>>> So i can't estimate wtp using the Wald command if one of the
>>> coeffecients
>>>>> is nonrandom. I also get the same error message when I apply the wald
>>>>> command after estimating a gmxl in utility space. Where could I be
>>> going
>>>>> wrong?
>>>>>
>>>>> Thanks in advance.
>>>>> Medard
>>>>>
>>>>> On Tue, Jul 24, 2018, 17:51 William Greene via Limdep <
>>>>> limdep at mailman.sydney.edu.au> wrote:
>>>>>
>>>>>> exactly right. I agree
>>>>>> Bill Greene
>>>>>>
>>>>>> On Tue, Jul 24, 2018 at 10:01 AM, Fredrik Carlsson <
>>>>>> fredrik.carlsson at economics.gu.se> wrote:
>>>>>>
>>>>>>> You have one less parameter, so reduce the number of parameters
>> in
>>>> the
>>>>>>> labels part of the Wald-command
>>>>>>>
>>>>>>> Fredrik
>>>>>>>
>>>>>>> Skickat från min iPhone
>>>>>>>
>>>>>>>> 24 juli 2018 kl. 15:53 skrev medard kakuru via Limdep <
>>>>>>> limdep at mailman.sydney.edu.au>:
>>>>>>>>
>>>>>>>> Thanks Bill.
>>>>>>>> I am facing another challenge. I use the wald command to
>> estimate
>>>> wtp
>>>>>>> after
>>>>>>>> estimating a mixed logit with all non-attribute coefficients
>>> given
>>>> a
>>>>>>> normal
>>>>>>>> distribution and the syntax works. Since the standard deviation
>>> for
>>>>> one
>>>>>>>> attribute was not significant, I re-specify the model and make
>>> that
>>>>>>>> attribute non-random. Running the wald command after this
>>>>> specification
>>>>>>>> gives me an error message that "wrong number of start values -
>>> need
>>>>> one
>>>>>>> for
>>>>>>>> each label". What could be the problem?
>>>>>>>>
>>>>>>>> Thanks.
>>>>>>>>
>>>>>>>> Medard
>>>>>>>>
>>>>>>>> On Sun, Jul 22, 2018 at 12:35 AM, William Greene via Limdep <
>>>>>>>> limdep at mailman.sydney.edu.au> wrote:
>>>>>>>>
>>>>>>>>> Medard. WTP for all variants of the RP logit model is
>> described
>>>> in
>>>>>>>>> Chapter N29. That would be good for the S-MNL and GMXL. I'm
>>>>>>>>> not sure what the G-MNL model is. WTP is generally a ratio of
>>>>>>>>> coefficients, though in RP models, the WTP is computed for
>> each
>>>>>>>>> individual. P values for LR statistics are generally not
>>>> computed.
>>>>>>>>> I'm not sure what the P-value at 5% is. You can use CALC to
>>> look
>>>>>>>>> up critical values for chi-squared if you wish. The function
>>>>>>>>> CTB(prob,df) returns the critical value for probability prob
>>> with
>>>>>>>>> degrees of freedom df.
>>>>>>>>> Regards
>>>>>>>>> /Bill Greene
>>>>>>>>>
>>>>>>>>> On Fri, Jul 20, 2018 at 5:22 AM, medard kakuru via Limdep <
>>>>>>>>> limdep at mailman.sydney.edu.au> wrote:
>>>>>>>>>
>>>>>>>>>> Dear All,
>>>>>>>>>> Kindly help me with the syntax for wtp in preference space. I
>>> am
>>>>>>> running
>>>>>>>>>> S-MNL, G-MNL and the GMXL models and want to compare WTP
>>>> estimates
>>>>>> for
>>>>>>>>> the
>>>>>>>>>> three models. I also want to compare these estimates with
>> those
>>>>>>> obtained
>>>>>>>>>> from wtp-space model estimations. I understand that for a
>>> simple
>>>>> MXL
>>>>>>>>> model,
>>>>>>>>>> the syntax for wtp is just a ratio of attribute and cost
>>>>>> coefficients.
>>>>>>> Is
>>>>>>>>>> it the case with the models I am estimating? I expected to
>> find
>>>> the
>>>>>>>>> syntax
>>>>>>>>>> in the Nlogit manual (section N33) but it's not listed.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Secondly, I have seen the syntax for carrying out a
>>> loglikelihood
>>>>>> ratio
>>>>>>>>>> test and the syntax gives the LR statistic. How do i go
>> further
>>>> to
>>>>>> get
>>>>>>> a
>>>>>>>>>> p-value (say at 5%) for the statistic?
>>>>>>>>>>
>>>>>>>>>> Thanks in advance.
>>>>>>>>>>
>>>>>>>>>> Regards, Medard
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Limdep site list
>>>>>>>>>> Limdep at mailman.sydney.edu.au
>>>>>>>>>> http://limdep.itls.usyd.edu.au
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> William Greene
>>>>>>>>> Department of Economics
>>>>>>>>> Stern School of Business, New York University
>>>>>>>>> 44 West 4 St., 7-90
>>>>>>>>> New York, NY, 10012
>>>>>>>>> URL: https://protect-au.mimecast.com/s/iN6HC4QZ1RFLO2YqtOFcSl?domain=people.stern.nyu.edu
>>>>>>>>> Email: wgreene at stern.nyu.edu
>>>>>>>>> Ph. +1.212.998.0876
>>>>>>>>> Editor in Chief: Journal of Productivity Analysis
>>>>>>>>> Editor in Chief: Foundations and Trends in Econometrics
>>>>>>>>> Associate Editor: Economics Letters
>>>>>>>>> Associate Editor: Journal of Business and Economic Statistics
>>>>>>>>> Associate Editor: Journal of Choice Modeling
>>>>>>>>> _______________________________________________
>>>>>>>>> Limdep site list
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>>>>>>>>> http://limdep.itls.usyd.edu.au
>>>>>>>>>
>>>>>>>>>
>>>>>>>> _______________________________________________
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>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> William Greene
>>>>>> Department of Economics
>>>>>> Stern School of Business, New York University
>>>>>> 44 West 4 St., 7-90
>>>>>> New York, NY, 10012
>>>>>> URL: https://protect-au.mimecast.com/s/iN6HC4QZ1RFLO2YqtOFcSl?domain=people.stern.nyu.edu
>>>>>> Email: wgreene at stern.nyu.edu
>>>>>> Ph. +1.212.998.0876
>>>>>> Editor in Chief: Journal of Productivity Analysis
>>>>>> Editor in Chief: Foundations and Trends in Econometrics
>>>>>> Associate Editor: Economics Letters
>>>>>> Associate Editor: Journal of Business and Economic Statistics
>>>>>> Associate Editor: Journal of Choice Modeling
>>>>>> _______________________________________________
>>>>>> Limdep site list
>>>>>> Limdep at mailman.sydney.edu.au
>>>>>> http://limdep.itls.usyd.edu.au
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> Limdep site list
>>>>> Limdep at mailman.sydney.edu.au
>>>>> http://limdep.itls.usyd.edu.au
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> William Greene
>>>> Department of Economics
>>>> Stern School of Business, New York University
>>>> 44 West 4 St., 7-90
>>>> New York, NY, 10012
>>>> URL: https://protect-au.mimecast.com/s/iN6HC4QZ1RFLO2YqtOFcSl?domain=people.stern.nyu.edu
>>>> Email: wgreene at stern.nyu.edu
>>>> Ph. +1.212.998.0876
>>>> Editor in Chief: Journal of Productivity Analysis
>>>> Editor in Chief: Foundations and Trends in Econometrics
>>>> Associate Editor: Economics Letters
>>>> Associate Editor: Journal of Business and Economic Statistics
>>>> Associate Editor: Journal of Choice Modeling
>>>> _______________________________________________
>>>> Limdep site list
>>>> Limdep at mailman.sydney.edu.au
>>>> http://limdep.itls.usyd.edu.au
>>>>
>>>>
>>> _______________________________________________
>>> Limdep site list
>>> Limdep at mailman.sydney.edu.au
>>> http://limdep.itls.usyd.edu.au
>>>
>>>
>>
>>
>> --
>> William Greene
>> Department of Economics
>> Stern School of Business, New York University
>> 44 West 4 St., 7-90
>> New York, NY, 10012
>> URL: https://protect-au.mimecast.com/s/iN6HC4QZ1RFLO2YqtOFcSl?domain=people.stern.nyu.edu
>> Email: wgreene at stern.nyu.edu
>> Ph. +1.212.998.0876
>> Editor in Chief: Journal of Productivity Analysis
>> Editor in Chief: Foundations and Trends in Econometrics
>> Associate Editor: Economics Letters
>> Associate Editor: Journal of Business and Economic Statistics
>> Associate Editor: Journal of Choice Modeling
>> _______________________________________________
>> Limdep site list
>> Limdep at mailman.sydney.edu.au
>> http://limdep.itls.usyd.edu.au
>>
>>
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